Hydrolysis and activated carbon gas fine desulfurization method and device

Abstract

The invention relates to a hydrolysis and activated carbon gas fine desulfurization method and device. The device comprises a pressure increasing machine, a heater, a hydrolysis reactor, a cooler, a front activated carbon desulfurization tank and a rear activated carbon desulfurization tank, a blast furnace gas pipeline is connected with a booster, an outlet of the booster is connected with a gas inlet of a heater, an outlet of the heater is connected with a hydrolysis reactor, and the heater is connected with an inlet steam pipeline and an outlet steam pipeline; an outlet of the hydrolysis reactor is connected with the cooler through an outlet gas pipeline; the outlet of the cooler is connected with the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank; and the outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected with the rear-end main pipeline. The method has the advantages that the blast furnace gas is desulfurized by adopting the method, the desulfurization efficiency (the ratio of the desulfurization amount to the total sulfur of the gas) is greater than 98%, and the total sulfur at an outlet is less than or equal to 10mg / Nm < 3 >.

Description

Technical Field

[0001] The invention belongs to the field of blast furnace gas purification, and in particular relates to a method and a device for desulfurizing the gas by hydrolysis and activated carbon. Background Art

[0002] At present, the steel industry has officially entered the "ultra-low emission" era, which requires the exhaust gas SO2 from blast furnace gas combustion in the ironmaking process to reach ultra-low emission limits. Some regions even require lower standards, with total sulfur at export ≤10mg / Nm 3 .

[0003] The concentration of gaseous sulfur pollutants in blast furnace gas is mostly concentrated in the range of 100-200 mg / Nm 3 Among them, organic sulfur is mainly carbonyl sulfide (COS), accounting for about 70%; inorganic sulfur is mainly hydrogen sulfide (H2S), accounting for 25% to 30%. The sulfur composition of blast furnace gas is complex, and carbonyl sulfide COS is relatively stable and difficult to react directly with other compounds. Therefore, the removal of COS and H2S is the key and difficulty.

[0004] Due to the short time when blast furnace gas fine desulfurization technology was developed, many of the devices put into operation and under construction have a series of problems such as immature process routes, large fluctuations in gas operating conditions, and operating levels. As a result, many devices occupy a large area, especially in old plant areas, are difficult to arrange, have poor long-term stable operation, and the desulfurization technology disposal efficiency is still low. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for desulfurization of blast furnace gas by hydrolysis and activated carbon, which can achieve a desulfurization efficiency (the ratio of desulfurization amount to total sulfur in gas) greater than 98% and an outlet total sulfur ≤ 10 mg / Nm 3 , meets ultra-low emission requirements, occupies a small area, and can operate stably for a long time.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A hydrolysis and activated carbon coal gas fine desulfurization device, comprising a pressure raising machine, a heater, a hydrolysis reactor, a cooler, a front activated carbon desulfurization tank, and a rear activated carbon desulfurization tank;

[0008] The blast furnace gas pipeline is connected to the booster, the booster outlet is connected to the heater air inlet, the heater outlet is connected to the hydrolysis reactor, and the heater is connected to an inlet steam pipeline and an outlet steam pipeline;

[0009] The outlet of the hydrolysis reactor is connected to the cooler via the outlet gas pipeline; the outlet of the cooler is connected to the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank, and the outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected to the rear end main pipeline.

[0010] It also includes a desulfurization tank inlet gas main pipeline and a desulfurization tank inlet gas branch pipeline. The desulfurization tank inlet gas main pipeline is connected to the outlet of the cooler, the desulfurization tank inlet gas main pipeline is connected to multiple desulfurization tank inlet gas branch pipelines, and the desulfurization tank inlet gas branch pipeline is connected to the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank.

[0011] The front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are both two-stage structures, each including two tank bodies.

[0012] The desulfurization tank inlet gas main pipeline is connected to the oxygen supply pipeline.

[0013] The hydrolysis reactor is a square structure, connected with pipelines by square flanges and reducers, a steam pipeline is connected to the middle of the hydrolysis reactor, and the bed temperature is maintained by steam heating; the hydrolysis reactor is filled with a carbonyl sulfide hydrolysis catalyst, and the heated blast furnace gas passes through the carbonyl sulfide hydrolysis catalyst from bottom to top to complete the hydrolysis process of converting organic sulfur into inorganic sulfur.

[0014] The outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected to the rear main pipeline via the front main pipeline; a spare cross pipeline between the front desulfurization tank and the rear desulfurization tank is connected between the front main pipeline and the desulfurization tank inlet gas main pipeline.

[0015] It also includes a nitrogen purge pipeline, which is connected to a pressure booster, a heater, a cooler, a front activated carbon desulfurization tank, and a rear activated carbon desulfurization tank.

[0016] The blast furnace gas pipeline is connected with a bypass pipeline.

[0017] A method for desulfurizing coal gas by hydrolysis and activated carbon, comprising the following steps:

[0018] 1) After the blast furnace gas is pressurized to 25-28 kPa by the pressure booster, it enters the heater;

[0019] 2) Use the low-pressure steam in the plant as heat energy and send it to the heater to heat the blast furnace gas to 140-160°C;

[0020] 3) Desulfurizing the blast furnace gas in a hydrolysis reactor using a carbonyl sulfide hydrolysis desulfurization catalyst, so that COS in the gas reacts with water to convert into H2S, and COS with a volume content of more than 85% in the blast furnace gas is converted into hydrogen sulfide;

[0021] 4) Clean circulating water is used to cool the blast furnace gas in the cooler. After the blast furnace gas temperature drops to 45-60°C, it enters the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank for deep desulfurization, and is finally sent to the pipeline network through the rear main pipeline.

[0022] The carbonyl sulfide hydrolysis catalyst in step 3) is in the shape of a square column with a bulk density of 0.85 to 0.95 kg / m3 The front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are filled with activated carbon desulfurizer, and the bulk density of the activated carbon desulfurizer is 0.48-0.58 kg / dm 3 , sulfur content ≥ 20%, carbon content ≥ 80%.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The method of the present invention is used to desulfurize blast furnace gas, and the desulfurization efficiency (the ratio of desulfurization to total sulfur in gas) is greater than 98%, and the total sulfur at the outlet is ≤10mg / Nm 3 .

[0025] 2. The present invention adopts carbonyl sulfide hydrolysis desulfurization catalyst in the hydrolysis reactor for hydrolysis, with a hydrolysis rate of ≥85%, a service life of ≥3 years, and a stable hydrolysis effect.

[0026] 3. The equipment of the present invention is compactly arranged and occupies a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the hydrolysis and activated carbon coal gas desulfurization device Figure 1 .

[0028] Figure 2 This is a schematic diagram of the structure of the hydrolysis and activated carbon coal gas desulfurization device Figure 2 .

[0029] In the figure: 1- blast furnace gas pipeline; 2- booster; 3- booster outlet gas pipeline; 4- heater; 5- heater inlet steam pipeline; 6- heater outlet steam pipeline; 7- heater outlet gas pipeline; 8- hydrolysis reactor; 9- hydrolysis reactor outlet gas pipeline; 10- cooler; 11- cooler outlet gas pipeline; 12- cooler inlet cooling water pipeline; 13- cooler outlet cooling water pipeline; 14- nitrogen purge main pipeline; 15- nitrogen purge Sweep pipeline; 16-nitrogen release pipeline; 17-bypass pipeline; 18-desulfurization tank inlet gas main pipeline; 19-oxygen supply pipeline; 20-desulfurization tank inlet gas branch pipeline; 21-front activated carbon desulfurization tank; 22-desulfurization tank outlet gas branch pipeline; 23-desulfurization tank activated carbon outlet; 24-spare cross pipeline between front desulfurization tank and rear desulfurization tank; 25-rear activated carbon desulfurization tank; 26-desulfurization tank outlet gas front end main pipeline; 27-desulfurization tank outlet gas rear end main pipeline. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0031] See Figure 1 , Figure 2, a hydrolysis and activated carbon coal gas fine desulfurization device, including a pressure booster 2, a heater 4, a hydrolysis reactor 8, a cooler 10, a front activated carbon desulfurization tank 21, and a rear activated carbon desulfurization tank 25; a blast furnace gas pipeline 1 is connected to the pressure booster 2, the outlet of the pressure booster 2 is connected to the heater 4 through the pressure booster outlet gas pipeline 3, the outlet of the heater 4 is connected to the hydrolysis reactor 8 through the heater outlet gas pipeline 7, and the heater 4 is connected with a heater inlet steam pipeline 5 and a heater outlet steam pipeline 6. The blast furnace gas pipeline 1 is provided with a blast furnace gas safety device, which is a pneumatic gas quick cut-off valve, an electric butterfly valve, and an electric blind plate valve in sequence. In addition, a sulfur content detection device is connected to the blast furnace gas pipeline 1. A detection device is connected to the connecting pipe between the outlet of the pressure booster 2 and the air inlet of the heater 4, and the detection device is a pressure, temperature and flow detection device. The heater outlet gas pipeline 7 is connected with a temperature and pressure detection device. The heater inlet steam pipeline 5 is connected with a shut-off valve and a regulating valve, and the regulating valve is interlocked with the temperature detection device on the heater outlet gas pipeline 7. The heater inlet steam pipeline 5 is also connected with a pressure, temperature and flow detection device. The heater outlet steam pipeline 6 is provided with a shut-off valve and a steam trap, which is discharged into the nearest drainage well.

[0032] The outlet of the hydrolysis reactor 8 is connected to the cooler 10 via the hydrolysis reactor outlet gas pipeline 9; the outlet of the cooler 10 is connected to the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 via the cooler outlet gas pipeline 11, and the outlets of the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are connected to the rear end main pipeline 27. The hydrolysis reactor outlet gas pipeline 9 is provided with a pressure and temperature detection device.

[0033] The hydrolysis reactor 8 is a square structure, connected with pipelines by square flanges and reducers, with external reinforcement ribs. A steam pipeline is connected to the middle of the hydrolysis reactor 8, and the bed temperature is maintained by steam heating. The hydrolysis reactor 8 is filled with a carbonyl sulfide hydrolysis catalyst, and the heated blast furnace gas passes through the carbonyl sulfide hydrolysis catalyst from bottom to top to complete the hydrolysis process of converting organic sulfur into inorganic sulfur. The hydrolysis reactor 8 is provided with 5 temperature detections and 4 pressure detections from top to bottom to monitor the hydrolysis state.

[0034] The hydrolysis and activated carbon coal gas fine desulfurization device also includes a desulfurization tank inlet gas main pipeline 18, four desulfurization tank inlet gas branch pipelines 20, the outlet of the cooler 10 is connected to the desulfurization tank inlet gas main pipeline 18 through the cooler outlet gas pipeline 11, the desulfurization tank inlet gas main pipeline 18 is connected to the four desulfurization tank inlet gas branch pipelines 20, and the desulfurization tank inlet gas branch pipeline 20 is connected to the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25. An electric butterfly valve is provided on the desulfurization tank inlet gas main pipeline 18; the desulfurization tank inlet gas main pipeline 18 is connected to the oxygen supply pipeline 19. The oxygen supply pipeline 19 is connected with a cut-off valve, a regulating valve, a venting pipeline 16 and a detection device, and the detection device includes pressure, temperature and flow detection. If the oxygen content in the desulfurization system can meet the needs of the H2S reaction, it is not necessary to open the oxygen supply pipeline 19, otherwise, it is necessary to open the oxygen supply pipeline 19.

[0035] The front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are both two-stage structures, each including two tank bodies. The first two of the four desulfurization tank inlet gas pipelines 20 are connected to the front activated carbon desulfurization tank 21 respectively, and the last two are connected to the rear activated carbon desulfurization tank 25 respectively. Electric butterfly valves and electric blind plate valves are provided on the four desulfurization tank inlet gas pipelines 20. The bottom of the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are both provided with a desulfurization tank activated carbon outlet 23, and the desulfurization tank activated carbon outlet 23 is connected to an electric ash discharge ball valve, which can be opened to release the waste activated carbon and transported by car.

[0036] The cooler 10 uses clean circulating water to cool the blast furnace gas. Since the gas temperature after the hydrolysis reactor 8 is relatively high, in order to ensure the adsorption efficiency of the activated carbon, the cooler 10 is used to reduce the blast furnace gas temperature. The blast furnace gas temperature at the outlet of the cooler 10 is 45-60°C. The cooler 10 is also connected to the cooler inlet cooling water pipeline 12 and the cooler outlet cooling water pipeline 13. A cut-off valve, a regulating valve, and a detection device are provided on the cooler inlet cooling water pipeline 12. The detection device includes pressure and flow detection, wherein the regulating valve is interlocked with the temperature detection device on the cooler outlet gas pipeline 11; a cut-off valve and a temperature detection are provided on the cooler outlet cooling water pipeline 13.

[0037] The blast furnace gas after cooling is sent to the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 to complete deep desulfurization. There are two-stage activated carbon adsorption, including 4 tanks, which are used in parallel in pairs or at the same time. Specifically, the outlets of the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are connected to the rear main pipeline 27 via the front main pipeline 26; the front main pipeline 26 and the desulfurization tank inlet gas main pipeline 18 are connected with the front desulfurization tank and the rear desulfurization tank The spare cross pipeline 24 is connected, and electric butterfly valves are provided on these three pipelines. Close the desulfurization tank inlet gas main pipeline 18 and the front main pipeline 26, open the spare cross pipeline 24 between the front desulfurization tank and the rear desulfurization tank, so that the blast furnace gas is first desulfurized by the two front activated carbon desulfurization tanks 21, and then by the rear activated carbon desulfurization tank 25, and the working system is to use two in parallel. If the desulfurization tank inlet gas main pipeline 18 and the front main pipeline 26 are opened, and the spare cross pipeline 24 between the front desulfurization tank and the rear desulfurization tank is closed, the blast furnace gas can enter the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 for desulfurization at the same time, and the working system is used simultaneously.

[0038] The front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are respectively connected to the four desulfurization tank outlet gas branch pipelines 22, and the desulfurization tank outlet gas branch pipelines 22 are also provided with electric blind valves and electric butterfly valves; the four desulfurization tank outlet gas branch pipelines 22 are further connected to the desulfurization tank outlet gas front end main pipeline 26, and the desulfurization tank outlet gas front end is provided with pressure and temperature detection devices; the desulfurization tank outlet gas front end is directly connected to the desulfurization tank outlet gas rear end main pipeline 27, and the desulfurization tank outlet gas rear end main pipeline 27 is provided with pressure, temperature, oxygen content, sulfur content detection devices, and electric blind valves and electric butterfly valves. The desulfurization tank outlet gas rear end main pipeline 27 is connected to the pipeline network, and the desulfurization efficiency can be calculated by comparing the sulfur content of the gas in the desulfurization tank outlet gas rear end main pipeline 27 with the sulfur content on the gas pipeline of the booster 2 inlet.

[0039] The hydrolysis and activated carbon gas fine desulfurization device also includes a nitrogen purge pipeline, which is connected to the pressure booster 2, the heater 4, the cooler 10, the front activated carbon desulfurization tank 21, and the rear activated carbon desulfurization tank 25. The nitrogen purge pipeline includes a nitrogen purge main pipeline 14, a nitrogen purge branch pipeline 15, and a nitrogen release pipeline 16, all of which belong to the nitrogen purge system and are set according to the blast furnace gas safety specifications.

[0040] The blast furnace gas pipeline 1 is connected with a bypass pipeline 17. The bypass pipeline 17 is provided with an electric butterfly valve and an electric blind plate valve. When the desulfurization system is overhauled, the bypass pipeline 17 is opened, and the blast furnace gas goes through the bypass pipeline 17. The blast furnace gas does not pass through the hydrolysis and activated carbon gas fine desulfurization device, and does not affect normal production.

[0041] The hydrolysis and activated carbon coal gas fine desulfurization device is arranged using the existing site. The roofs of the operation room and the instrument room are used as the second platform, and the third platform is built. The front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are arranged on the second platform and the third platform. The heater 4 and the cooler 10 are arranged using the gap between the two platforms where the desulfurization tanks 21 and 25 are located. The hydrolysis reactor 8 has a small plane size of only 1400×1400mm. Various large pipelines make full use of the frame columns and beams for bracket arrangement. Combined with the above, the entire device and pipelines are arranged in a horizontal rectangular 20000×6700mm frame, which greatly reduces the footprint of the device.

[0042] The method for desulfurization of coal gas by hydrolysis and activated carbon comprises the following steps:

[0043] 1) Blast furnace gas needs to pass through the hydrolysis reactor 8 and the activated carbon desulfurization tank, which inevitably causes pressure loss and affects production. A pressure booster 2 must be installed at the front end to meet production needs. After the pressure of the blast furnace gas is increased to 25-28 kPa by the pressure booster 2, it enters the heater 4.

[0044] 2) The low-pressure steam in the plant is used as heat energy and sent to heater 4 to heat the blast furnace gas to 140-160° C. to achieve the conditions for the organic sulfur hydrolysis reaction.

[0045] 3) The blast furnace gas is desulfurized in the hydrolysis reactor 8 using a carbonyl sulfide hydrolysis desulfurization catalyst, so that COS in the gas reacts with water to convert into H2S, and COS with a volume content of more than 85% in the blast furnace gas is converted into hydrogen sulfide. At the same time, the catalyst has a long life and the hydrolysis effect is stable. The reaction process is:

[0046] COS+H2O=H2S+CO2, reaction temperature: 140~160℃.

[0047] The carbonyl sulfide hydrolysis catalyst is white, square columnar, with specifications of 135×135×500mm and a bulk density of 0.85~0.95kg / m 3 The catalyst can play a good catalytic role in the hydrolysis reaction of carbonyl sulfide at a higher concentration of hydrogen sulfide, so that COS in the coal gas reacts with water to be converted into H2S.

[0048] 4) Clean circulating water is used to cool the blast furnace gas in the cooler 10. After the temperature of the blast furnace gas drops to 45-60°C, it enters the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 for deep desulfurization. The H2S generated after hydrolysis in the gas and the H2S remaining in the gas react with oxygen in the tank to generate elemental sulfur, which is adsorbed on the activated carbon to complete the deep desulfurization of the gas. Finally, it is sent to the gas network through the rear main pipeline 27.

[0049] The reaction process in this process is as follows:

[0050] 2H2S+O2=1 / 4S8+2H2O, reaction temperature: 45~60℃.

[0051] The front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are filled with activated carbon desulfurization agent, and the specifications of the activated carbon desulfurization agent are Its bulk density is 0.48~0.58kg / dm 3 , sulfur content ≥ 20%, carbon content ≥ 80%.

[0052] The present invention adopts carbonyl sulfide hydrolysis desulfurization catalyst in the hydrolysis reactor, the hydrolysis rate is ≥85%, the service life is ≥3 years, and the hydrolysis effect is stable. The method of the present invention is used to desulfurize blast furnace gas, the desulfurization efficiency (the ratio of the amount of desulfurization to the total sulfur in the gas) is greater than 98%, and the total sulfur at the outlet is ≤10mg / Nm 3 .

Claims

1. A hydrolysis and activated carbon coal gas desulfurization device, characterized in that: It includes a pressure booster, a heater, a hydrolysis reactor, a cooler, a front activated carbon desulfurization tank, and a rear activated carbon desulfurization tank; The blast furnace gas pipeline is connected to the booster, the booster outlet is connected to the heater air inlet, the heater outlet is connected to the hydrolysis reactor, and the heater is connected to an inlet steam pipeline and an outlet steam pipeline; The outlet of the hydrolysis reactor is connected to the cooler via the outlet gas pipeline; the outlet of the cooler is connected to the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank, and the outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected to the rear end main pipeline.

2. A hydrolysis and activated carbon coal gas desulfurization device according to claim 1, characterized in that: It also includes a desulfurization tank inlet gas main pipeline and a desulfurization tank inlet gas branch pipeline. The desulfurization tank inlet gas main pipeline is connected to the outlet of the cooler, the desulfurization tank inlet gas main pipeline is connected to multiple desulfurization tank inlet gas branch pipelines, and the desulfurization tank inlet gas branch pipeline is connected to the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank.

3. A hydrolysis and activated carbon coal gas desulfurization device according to claim 2, characterized in that: The front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are both two-stage structures, each including two tank bodies.

4. A hydrolysis and activated carbon coal gas desulfurization device according to claim 2, characterized in that: The desulfurization tank inlet gas main pipeline is connected to the oxygen supply pipeline.

5. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1 is characterized in that: The hydrolysis reactor is a square structure, connected with pipelines by square flanges and reducers, a steam pipeline is connected to the middle of the hydrolysis reactor, and the bed temperature is maintained by steam heating; the hydrolysis reactor is filled with a carbonyl sulfide hydrolysis catalyst, and the heated blast furnace gas passes through the carbonyl sulfide hydrolysis catalyst from bottom to top to complete the hydrolysis process of converting organic sulfur into inorganic sulfur.

6. A hydrolysis and activated carbon coal gas desulfurization device according to claim 1, characterized in that: The outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected to the rear main pipeline via the front main pipeline; a spare cross pipeline between the front desulfurization tank and the rear desulfurization tank is connected between the front main pipeline and the desulfurization tank inlet gas main pipeline.

7. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1 is characterized in that: It also includes a nitrogen purge pipeline, which is connected to a pressure booster, a heater, a cooler, a front activated carbon desulfurization tank, and a rear activated carbon desulfurization tank.

8. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1 is characterized in that: The blast furnace gas pipeline is connected with a bypass pipeline.

9. A method for desulfurization of coal gas by hydrolysis and activated carbon implemented by the device according to any one of claims 1 to 8, characterized in that: The following steps are involved: 1) After the blast furnace gas is pressurized to 25-28 kPa by the pressure booster, it enters the heater; 2) Use the low-pressure steam in the plant as heat energy and send it to the heater to heat the blast furnace gas to 140-160°C; 3) Desulfurizing the blast furnace gas in a hydrolysis reactor using a carbonyl sulfide hydrolysis desulfurization catalyst, so that COS in the gas reacts with water to convert into H2S, and COS with a volume content of more than 85% in the blast furnace gas is converted into hydrogen sulfide; 4) Clean circulating water is used to cool the blast furnace gas in the cooler. After the blast furnace gas temperature drops to 45-60°C, it enters the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank for deep desulfurization, and is finally sent to the pipeline network through the rear main pipeline.

10. A method for desulfurization of coal gas by hydrolysis and activated carbon according to claim 9, characterized in that: The carbonyl sulfide hydrolysis catalyst in step 3) is in the shape of a square column with a bulk density of 0.85 to 0.95 kg / m 3 The front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are filled with activated carbon desulfurizer, and the bulk density of the activated carbon desulfurizer is 0.48-0.58 kg / dm 3 , sulfur content ≥ 20%, carbon content ≥ 80%.

Images